Magazine grinder for wood pulp



April 15, 1930. H, WHW 1,754,536

MAGAZINE GRINDER FOR WOOD PULP Filed Jan. 12, 1928 2 Sheets-Sheet 1 II'II IL ILIL IFTE ICIC IFIL ILI ILIE ICIF If II IL IL IK IU IE II: ":IL IL IL IFIF ILIITII: IL I IL If IQ Ill ":I

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MAGAZINE GRINDER FOR WOOD PULP Filed Jan 12, 1928 2 Sheets-Sheet 2 I]! In In In :H In in in:

In In In In In 'H ii In IN VENTOR AMBROSE.H.WHITE ATTORNE YS Patented Apr. 15, 1930 FATE.

oF Ics AMBROSE H. WHITE, 01* BRONXVILLE, NEW YORK MAGAZINE GRINDER FOR WOOD PULP Application filed January 12, 1828. Serial No. 246,342.

This invention relates to wood pulp grinders of the type in which the wood in the form of logs or billets is fed to the action of the grinder through a magazine by pressure applied to the charge, the object of the inven tion being to so apply the pressure that it will be uniformly and evenly distributed throughout the charge, and there will be no liability of the logs forming an arch within the magazine during the grinding operation and thereby interrupting the feeding action.

A further object of the invention is to provide a mechanism which will reduce to a minimum the friction between the logs and the sides of the magazine during the grinding operation.

According to my invention in carrying out the main object thereof, means are provided for advancing the wood in the magazine,

2 which will act to separate the charge of wood into separate batches, said means being constructed so as to apply pressure separately to each batch and acting to advance the charge as a whole so as to force the wood against the grinder.

In the more specific embodiment of the invention, the magazine for the wood is disposed in an upright or substantially upright position, and the charge of wood in the magazine is divided into a number of batches by means of cross bars secured at intervals to endless travelling chains disposed at opposite sides of the magazine and passing around sprocket wheels positioned at the top and bottom of the magazine, the said cross bars engaging the logs preferably adjacent their ends so as to exert thereon an evenly distributed pressure as they are advanced towards the grinder by the travel of the chains. In

this way, the magazine is divided by the cross bars into a plurality of compartments, so that the logs will be carried in batches through the magazine in the feed of the charge towards the grinder.

In the drawings which show one form of my invention Figure 1 is a front elevation of no improved magazine grinder with the front plate removed.

# Figure 2 is a sectional side elevation of the magazine taken on the line 22 Fig ure 1.

Figure 3 is a part front sectional elevation of the lower part of the magazine with antifriction surfaces mounted therein.

Figure 4 is a part sectional side elevation of the part of the magazine shown in Figure 3.

Referring more particularly to the draw lugs, 11 designates a vertically disposed magazine of rectangular form. Mounted in suitable hearings 12 at the top and extending across the sides of the magazine are the spindles 13 which have keyed, or otherwise secured thereto, the sprocket wheels 14. R0 tatably mounted in suitable bearings 15 and extending across the sides in proximity to the bottom of the magazine are the spindles 17 to which are secured the sprocket wheels 18. Endless chains 19 extend around the sprockets and are positioned'on the outside of the magazine adjacent the corners thereof. Secured to the endless chains in spaced relation are the cross-bars or beams 20, which lie close to the sides of the magazine, to engage with the ends of the logs 21 therein. The crossbars lie parallel to the sides and within the magazine. The lower sprocket spindles may be driven by any means such as the worms and worm wheels 22 which are connected to a suitable driving medium.

In the drawings, the magazine is shown Wider at the bottom than at the top, but it will be readily understood that the front and rear portions of the magazine may be substantially parallel, if so desired. The magazine is positioned above a grindstone 23 which is secured to a shaft 24 rotatably mounted in suitable bearings 25 driven by any suitable means.

The lower batch of wood in the compartment in proximity to the grindstone is subjected to a pressure from the cross-bars, and the wood may tend to spread and exert excessive friction on the walls of the magazine. To reduce this friction to a minimum, antifriction walls may be provided at the lower end of the magazine, as shown in Figures 3 and 4. These walls as shown consist of a series of chain links 26 with their ends secured to the wall. A series of rollers 27 rotatably mounted on the link pins preferably, but not necessarily, in staggered formation, are adapted to engage with the sides of the logs. The rollers turn due to their contact with the logs, so that the friction between the logs and the side of the magazine is reduced to a minimum, thereby resulting in a considerable saving in the power required to drive the feed chains.

In operation the pulp wood logs are fed into the magazine with their longitudinal axis parallel. It will be seen that the logs are separated into batches within the compartments formed between successive cross-bars, and are forced towards the grindstone by driving the chains in the direction indicated by the arrows. When the magazine is made slightly larger in cross sectional area at the bottom than at the top, the logs tend to spread so that they will not bind or form an arch above the stone. The feed pressure exerted by the cross-bars upon the top of the logs in each batch is constant, uniform and evenly distributed. This feed pressure is distributed bet-ween the chains which, of course, may be driven independently, or in any other desired way. The feed and pressure mechanism is simple in construction and efiicient in operation. The weight of the wood in the upper compartments is carried by the chains and the load assists in increasing the pressure on the lowermost batch which is being ground.

This structure has all the advantages of a continuous vertical magazine grinder as well as those advantages of a pocket magazine or pressure grinder.

While the invention has been shown as applied to a vertical magazine grinder it will be obvious that it may be applied to magazines disposed horizontally or, in fact, at any angle to the grindstone.

Having thus described my invention, what I claim is 1. In a pulp wood grinder, a vertically disposed magazine and means for conveying pulp Wood in batches through the magazine and feeding same to the grindstone, said means comprising transverse members separating said batches and movable longitudinally of the magazine to apply uniform pressure to the batch located in advance of said members, suitably supported endless chains connected by and carrying said members and means for operating said chains.

2. In a pulp wood grinder, a vertically disposed magazine and means for feeding a charge of pulp wood through the magazine to a grindstone in successive independent batches, said means comprising members extending transversely of the magazine between the several batches and positioned to engage the terminals of the logs separated thereby, endless chains carrying said members and means for operating said chains.

3. In a wood pulp grinder, a magazine adapted to contain a charge of wood, endless chains on opposite sides of the magazine, and means connecting the chains for dividing the magazine into a plurality of compartments containing independent batches of wood.

4. In a wood pulp grinder, a magazine adapted to contain a charge of wood, endless chains mounted on each side of the magazine, and means connecting said chains for dividing the wood into independent batches and for applying constant uniformly distributed pressure to the wood as it is fed to the grinder.

5. In a grinder for pulp wood, the combination of a magazine adapted to contain a charge of wood in which the logs are arranged with their longitudinal axes parallel *ith each other or substantially so, chains mounted at the sides of the magazine and adapted to travel longitudinally thereof, and cross members connecting the chains at intervals and extending in the magazine and adapted to bear on the logs at or adjacent their ends; whereby the charge of wood will be divided into batches each receiving its feeding pressure from its associated cross members.

In a wood pulp grinder, the combination of a vertically disposed magazine, a series of vertically spaced transversely extending members movable within and longitudinally of the magazine, said members being arranged to separate the wood charge into several distinct batches and to engage the terminals of the logs separated thereby whereby said members are adapted to support the batch resting thereon and to apply uniform feeding pressure to the batch lying directly therebeneath.

7. In a wood pulp grinder, the combination of a vertically disposed magazine adapted to receive a charge of pulp logs disposed in parallel relation, a series of vertically spaced transverse members extending within and across the magazine in a direction at right angles to the length of the logs and serving to divide the latter into a series of independent batches, said members being positioned to engage the terminals of the logs separated thereby and means for causing said members to travel within and longitudinally of the magazine.

In witness whereof, I have hereunto set my hand.

AMBROSE H. WHITE. 

